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POCIL: "Operation could destabilize the runtime" exception
 

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    <p>I've been playing with PostSharp a bit and I ran into a nasty problem.</p> <p>Following IL in Silverlight assembly:</p> <pre><code>.method public hidebysig specialname newslot virtual final instance void set_AccountProfileModifiedAt(valuetype [mscorlib]System.DateTime 'value') cil managed { .maxstack 2 .locals ( [0] bool ~propertyHasChanged, [1] bool CS$4$0000) L_0000: nop L_0001: nop L_0002: ldarg.0 L_0003: call instance valuetype [mscorlib]System.DateTime Accounts.AccountOwner::get_AccountProfileModifiedAt() L_0008: ldarg.1 L_0009: call bool [mscorlib]System.DateTime::op_Inequality(valuetype [mscorlib]System.DateTime, valuetype [mscorlib]System.DateTime) L_000e: stloc.0 L_000f: ldarg.0 L_0010: ldarg.1 L_0011: stfld valuetype [mscorlib]System.DateTime Accounts.AccountOwner::accountProfileModifiedAt L_0016: br.s L_0018 L_0018: ldloc.0 L_0019: ldc.i4.0 L_001a: ceq L_001c: stloc.1 L_001d: ldloc.1 L_001e: brtrue.s L_002b L_0020: ldarg.0 L_0021: ldstr "AccountProfileModifiedAt" L_0026: call instance void Accounts.AccountOwner::NotifyPropertyChanged(string) L_002b: nop L_002c: leave.s L_002e L_002e: ret } </code></pre> <p>triggers System.Security.VerificationException: Operation could destabilize the runtime. exception. Reflector parses it OK. What could be wrong with it?</p> <p><b>Update 1</b> Code is intended to work as follows:</p> <pre><code>public void set_AccountProfileModifiedAt(DateTime value) { bool propertyHasChanged = this.AccountProfileModifiedAt != value; this.accountProfileModifiedAt = value; if (propertyHasChanged) { this.NotifyPropertyChanged("AccountProfileModifiedAt"); } } </code></pre> <p><b>Update 2</b> I get specified exception inside the setter itself</p> <p><b>Update 3</b> Making non-static calls as callvirt (NotifyPropertyChanged) does not help</p> <p><b>Update 4</b> Commenting out (for test purposes) code:</p> <pre><code>L_0018: ldloc.0 L_0019: ldc.i4.0 L_001a: ceq L_001c: stloc.1 L_001d: ldloc.1 </code></pre> <p>and replacing L_001e: brtrue.s L_002b with L_001e: br.s L_002b does the trick but it's an unconditional return - not what I want.</p> <p><b> Update 5</b> If I use C# compiler to mimic required behavior (I still need to do that with Postsharp) I get following IL:</p> <pre><code>.method public hidebysig specialname newslot virtual final instance void set_AccountProfileModifiedAt(valuetype [mscorlib]System.DateTime 'value') cil managed { .maxstack 2 .locals init ( [0] bool val, [1] bool CS$4$0000) L_0000: nop L_0001: ldarg.0 L_0002: call instance valuetype [mscorlib]System.DateTime Accounts.AccountOwner::get_AccountProfileModifiedAt() L_0007: ldarg.1 L_0008: call bool [mscorlib]System.DateTime::op_Inequality(valuetype [mscorlib]System.DateTime, valuetype [mscorlib]System.DateTime) L_000d: stloc.0 L_000e: ldarg.0 L_000f: ldarg.1 L_0010: stfld valuetype [mscorlib]System.DateTime Accounts.AccountOwner::accountProfileModifiedAt L_0015: ldloc.0 L_0016: ldc.i4.0 L_0017: ceq L_0019: stloc.1 L_001a: ldloc.1 L_001b: brtrue.s L_0029 L_001d: ldarg.0 L_001e: ldstr "AccountProfileModifiedAt" L_0023: call instance void Accounts.AccountOwner::NotifyPropertyChanged(string) L_0028: nop L_0029: ret } </code></pre> <p>Note there are minor differences - extra br.s jump at L_0016 and some strange jump L_001e: brtrue.s L_002b. In compiler version I get direct jump to ret.</p>
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